12:21 am

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The modern hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours and minutes passed since midnight, from 00 to 23 This system, as opposed to the hour clock , is the most commonly used time notation in the world today, [A] and is used by the international standard ISO A number of countries, particularly English speaking, use the hour clock, or a mixture of the and hour time systems. In countries where the hour clock is dominant, some professions prefer to use the hour clock. For example, in the practice of medicine , the hour clock is generally used in documentation of care as it prevents any ambiguity as to when events occurred in a patient's medical history.

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The leading zero is very commonly used in computer applications, and always used when a specification requires it for example, ISO

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Some countries, including the US, Canada, and Australia, use the hour clock format including am and pm. What do these abbreviations mean? Is midnight am or pm? The hour system divides the 24 hours of a day into two periods lasting 12 hours each. The first hour period is designated as am.

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Normally time is shown as Hours:Minutes. See here. Midnight has another problem: there is nothing to tell us "is this the beginning or ending of the day". Imagine your friends say they are leaving for holiday at "midnight" on 12th March, what day should you arrive to say goodbye? Do you get there on the 11th assuming they leave at the very start of the 12th , or the 12th assuming they leave at the end of the 12th?

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Feedback form Hi! That this universal day is to be a mean solar day; is to begin for all the world at the moment of midnight of the initial meridian coinciding with the beginning of the civil day and date of that meridian, and is to be counted from zero up to twenty-four hours. The answer is: Contents move to sidebar hide. AM PM. Absolute space and time Spacetime Chronon Continuous signal Coordinate time Cosmological decade Discrete time and continuous time Proper time Theory of relativity Time dilation Gravitational time dilation Time domain Time translation symmetry T-symmetry. ACP I. The notation mainly serves to refer to the exact end of a day in a time interval. El Paso. Toggle limited content width.

None of us is living in the 90s era of digital wristwatches anymore.

For the film, see film. How long until AM? Download as PDF Printable version. October For example, Microsoft Windows and macOS activate the hour notation by default only if a computer is in a handful of specific language and region settings. The Canadian Pacific Railway was among the first organisations to adopt the hour clock, at midsummer Related Calculations. Project Gutenberg. The modern hour system is a lateth century adaptation of the German midnight-starting system, and then prevailed in the world with the exception of some Anglophone countries. A time of day is written in the hour notation in the form hh:mm for example or hh:mm:ss for example, , where hh 00 to 23 is the number of full hours that have passed since midnight , mm 00 to 59 is the number of full minutes that have passed since the last full hour, and ss 00 to 59 is the number of seconds since the last full minute. El Paso. For the Christian metal album, see Veni Domine. POSIX programs such as ls default to displaying timestamps in hour format. Retrieved 27 July Toggle limited content width.